Econ. Environ. Geol. 2005; 38(1): 79-89

Published online February 28, 2005

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Analysis of Hydraulic Gradient at Coastal Aquifers in Eastern Part of Jeju Island

Kue-Young Kim1*, Byoung-Ohan Shim1, Ki-Hwa Park1, Taehee Kim1, Hyeonjeong Seong1, Yun-Seok Park2, Gi-Won Koh2 and Nam-Chil Woo3

1Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources Daejeon 305-350, Korea
2Water Resources Research section, Jeju Provincial Water Resources Management Office, Jeju 695-811, Korea
3Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea

Correspondence to :

Kue-Young Kim

kykim@kigam.re.kr

Received: November 19, 2004; Accepted: February 21, 2005

Abstract

Groundwater level changes in coastal aquifers occur due to oceanic tides, where the properties of oceanic tides can be applied to estimate hyadraulic parameters. Hydraulic parameters of coastal aquifers located in eastern part of Jeju island were estimated using the tidal response technique. Groundwater level data from a saltwater intrusion monitoring well system was used which showed tidal effects from 3 to 5 km. The hydraulic gradient was assessed by utilizing the filtering method from 71 consecutive hourly water-level observations. Calculated hydraulic diffusivity ranged from 2.94×107m2d-1 to 4.36×107m2d-1. The hydraulic gradient of the coastal aquifer area was found to be ~10-4, whereas the gradient of the area between wells Handong-1 and 2 was found to be ~10-6, which is very low comparatively. Analysis of groundwater monitoring data showed that groundwater levels are periodically higher near coastal areas compared to that of inner land areas due to oceanic tide influences. When assessing groundwater flow direction in coastal aquifers it is important to consider tidal fluctuation.

Keywords Jeju island, coastal aquifer, hydraulic gradient, hydraulic diffusivity

Article

Econ. Environ. Geol. 2005; 38(1): 79-89

Published online February 28, 2005

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Analysis of Hydraulic Gradient at Coastal Aquifers in Eastern Part of Jeju Island

Kue-Young Kim1*, Byoung-Ohan Shim1, Ki-Hwa Park1, Taehee Kim1, Hyeonjeong Seong1, Yun-Seok Park2, Gi-Won Koh2 and Nam-Chil Woo3

1Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources Daejeon 305-350, Korea
2Water Resources Research section, Jeju Provincial Water Resources Management Office, Jeju 695-811, Korea
3Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea

Correspondence to:

Kue-Young Kim

kykim@kigam.re.kr

Received: November 19, 2004; Accepted: February 21, 2005

Abstract

Groundwater level changes in coastal aquifers occur due to oceanic tides, where the properties of oceanic tides can be applied to estimate hyadraulic parameters. Hydraulic parameters of coastal aquifers located in eastern part of Jeju island were estimated using the tidal response technique. Groundwater level data from a saltwater intrusion monitoring well system was used which showed tidal effects from 3 to 5 km. The hydraulic gradient was assessed by utilizing the filtering method from 71 consecutive hourly water-level observations. Calculated hydraulic diffusivity ranged from 2.94×107m2d-1 to 4.36×107m2d-1. The hydraulic gradient of the coastal aquifer area was found to be ~10-4, whereas the gradient of the area between wells Handong-1 and 2 was found to be ~10-6, which is very low comparatively. Analysis of groundwater monitoring data showed that groundwater levels are periodically higher near coastal areas compared to that of inner land areas due to oceanic tide influences. When assessing groundwater flow direction in coastal aquifers it is important to consider tidal fluctuation.

Keywords Jeju island, coastal aquifer, hydraulic gradient, hydraulic diffusivity

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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